Resolving dependencies... cabal: Could not resolve dependencies: next goal: btree-concurrent (user goal) rejecting: btree-concurrent-0.1.5, 0.1.4, 0.1.3, 0.1.1 (global constraint requires ==0.1.0) trying: btree-concurrent-0.1.0 next goal: cprng-aes (dependency of btree-concurrent-0.1.0) rejecting: cprng-aes-0.6.1, 0.6.0, 0.5.2, 0.5.1, 0.5.0, 0.4.0, 0.3.4, 0.3.3, 0.3.2, 0.3.1, 0.3.0 (conflict: btree-concurrent => cprng-aes==0.2.*) trying: cprng-aes-0.2.5 trying: crypto-api-0.13.2 (dependency of cprng-aes-0.2.5) trying: tagged-0.8.0.1 (dependency of crypto-api-0.13.2) next goal: template-haskell (dependency of tagged-0.8.0.1) rejecting: template-haskell-2.9.0.0/installed-3af... (conflict: template-haskell => containers==0.5.5.1/installed-23e..., btree-concurrent => containers==0.4.*) rejecting: template-haskell-2.10.0.0 (conflict: base==4.7.0.1/installed-e4b..., template-haskell => base==4.8.*) trying: template-haskell-2.9.0.0 next goal: containers (dependency of btree-concurrent-0.1.0) rejecting: containers-0.5.5.1/installed-23e..., 0.5.6.3, 0.5.6.2, 0.5.6.1, 0.5.6.0, 0.5.5.1, 0.5.5.0, 0.5.4.0, 0.5.3.1, 0.5.3.0, 0.5.2.1, 0.5.2.0, 0.5.1.0, 0.5.0.0 (conflict: btree-concurrent => containers==0.4.*) rejecting: containers-0.4.2.1, 0.4.2.0, 0.4.1.0, 0.4.0.0 (conflict: template-haskell => containers==0.5.*) rejecting: containers-0.3.0.0, 0.2.0.1, 0.2.0.0, 0.1.0.1, 0.1.0.0 (conflict: btree-concurrent => containers==0.4.*) Dependency tree exhaustively searched.